Lift off the gas when shifting. Just imagine that you are super fast at shifting so it only takes a quick lift of the throttle.

This will ensure a good shift.

It's very simple really if you have experience with manuals and treat smg as a manual that you don't have to push the clutch in with your left foot. Very simple really. I had no problems with the SMG from the get go cause I drove it like a manual.

Tangent: That being said.......I don't like SMG cause you have to drive it like a manual. What? you say, yeah day to day driving I find it tiresome and not as satisfying as shifting myself. Yes, it's less physical effort than pushing a clutch in but in regular driving I just find it annoying. If I didn't want to shift myself I would just get an auto. My opinon, SMG great for racing and track work but not so good on the street. On the track it is unbeatable. But really, how often do we track our cars? I don't live near the Nurburgring anymore so no more SMG for me.....